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      <a href="/2017/08/20/webpack-multi-project-7-source-map-and-uglifyjs/" title="webpack多页面配置7--source map和代码压缩" itemprop="url">webpack多页面配置7--source map和代码压缩</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-08-20T03:23:18.000Z" itemprop="datePublished">2017-08-20</time>
    更新日期:<time datetime="2017-08-20T03:23:16.886Z" itemprop="dateModified">2017-08-20</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#devtool"><span class="toc-number">1.</span> <span class="toc-text">devtool</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#关于source-map"><span class="toc-number">1.1.</span> <span class="toc-text">关于source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#devtool选项"><span class="toc-number">1.2.</span> <span class="toc-text">devtool选项</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#开发环境添加source-map"><span class="toc-number">1.3.</span> <span class="toc-text">开发环境添加source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#生产环境source-map"><span class="toc-number">1.4.</span> <span class="toc-text">生产环境source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#代码压缩"><span class="toc-number">1.5.</span> <span class="toc-text">代码压缩</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近项目中需要搭建一个多页面的环境，包括本地路由服务和分页面打包。<br>本节介绍开发部署和生产环境打包时，启用source map相关配置。<br><a id="more"></a></p>
<h2 id="devtool"><a href="#devtool" class="headerlink" title="devtool"></a>devtool</h2><hr>
<p>此选项控制是否生成，以及如何生成<code>source map</code>。</p>
<h3 id="关于source-map"><a href="#关于source-map" class="headerlink" title="关于source map"></a>关于source map</h3><p>当webpack打包源代码时，可能会很难追踪到错误和警告在源代码中的原始位置。<br>例如，如果将多个源文件打包到一个文件中，而其中一个源文件包含一个错误，那么堆栈跟踪就会简单地指向到该文件。这并通常没有太多帮助，因为你可能需要准确地知道错误来自于哪个源文件。</p>
<p>为了更容易地追踪错误和警告，JavaScript提供了<code>source map</code>功能，将编译后的代码映射回原始源代码。</p>
<h3 id="devtool选项"><a href="#devtool选项" class="headerlink" title="devtool选项"></a>devtool选项</h3><p>对于开发环境，通常希望更快速的<code>Source Map</code>，需要添加到<code>bundle</code>中以增加体积为代价。<br>但是对于生产环境，则希望更精准的<code>Source Map</code>，需要从<code>bundle</code>中分离并独立存在。</p>
<ul>
<li><p>开发环境</p>
<ul>
<li><code>eval</code> <ul>
<li>每个模块都使用<code>eval()</code>执行，并且都有<code>//@ sourceURL</code>。</li>
<li>此选项会相当快地构建。主要缺点是，由于会映射到转换后的代码，而不是映射到原始代码，所以不能正确的显示显示行数。</li>
</ul>
</li>
<li><code>inline-source-map</code> <ul>
<li><code>SourceMap</code>转换为<code>DataUrl</code>后添加到<code>bundle</code>中。</li>
</ul>
</li>
<li><code>eval-source-map</code><ul>
<li>每个模块使用<code>eval()</code>执行，并且<code>SourceMap</code>转换为<code>DataUrl</code>后添加到<code>eval()</code>中。</li>
<li>初始化<code>SourceMap</code>时比较慢，但是会在重构建时提供很快的速度，并且生成实际的文件。行数能够正确映射，因为会映射到原始代码中。</li>
</ul>
</li>
<li><code>cheap-eval-source-map</code><ul>
<li>和<code>eval-source-map</code>类似，每个模块都使用<code>eval()</code>执行。</li>
<li>使用此选项，<code>Source Map</code>将传递给<code>eval()</code>作为<code>Data URL</code>调用。它是“低性能开销”的，因为它没有映射到列，只映射到行数。</li>
</ul>
</li>
<li><code>cheap-module-eval-source-map</code>（推荐使用）<ul>
<li>和<code>cheap-eval-source-map</code>类似，然而，在这种情况下，<code>loader</code>能够处理映射以获得更好的结果。</li>
</ul>
</li>
</ul>
</li>
<li><p>生产环境</p>
<ul>
<li><code>source-map</code> <ul>
<li>生成完整的<code>SourceMap</code>，输出为独立文件。</li>
<li>由于在<code>bundle</code>中添加了引用注释，所以开发工具知道在哪里去找到<code>SourceMap</code>。</li>
</ul>
</li>
<li><code>hidden-source-map</code> <ul>
<li>和<code>source-map</code>相同，但是没有在<code>bundle</code>中添加引用注释。</li>
<li>如果你只想要<code>SourceMap</code>映射错误报告中的错误堆栈跟踪信息，但不希望将<code>SourceMap</code>暴露给浏览器开发工具。</li>
</ul>
</li>
<li><code>cheap-source-map</code> <ul>
<li>不带列映射(column-map)的<code>SourceMap</code>，忽略加载的<code>Source Map</code>。</li>
</ul>
</li>
<li><code>cheap-module-source-map</code><ul>
<li>不带列映射(column-map)的<code>SourceMap</code>，将加载的<code>Source Map</code>简化为每行单独映射。</li>
</ul>
</li>
<li><code>nosources-source-map</code> <ul>
<li>创建一个没有<code>sourcesContent</code>的<code>SourceMap</code>。</li>
<li>它可以用来映射客户端上的堆栈跟踪，而不会暴露所有的源码。</li>
</ul>
</li>
</ul>
</li>
</ul>
<p>参考<a href="https://doc.webpack-china.org/configuration/devtool/" target="_blank" rel="external">开发辅助调试工具(Devtool)</a>。</p>
<h3 id="开发环境添加source-map"><a href="#开发环境添加source-map" class="headerlink" title="开发环境添加source map"></a>开发环境添加source map</h3><p>这里我们简单地添加<code>devtool</code>：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// build/dev-server.js</span></div><div class="line">webpackConfig.devtool = <span class="string">'eval-cheap-module-source-map'</span></div></pre></td></tr></table></figure>
<p>同时，在配置文件中，还有一个要点是<code>publicPath</code>不是<code>/</code>这样的值，而是<code>http://localhost:3000/</code>这样的绝对地址。这是因为，在使用?sourceMap的时候，style-loader会把css的引入做成这样：</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><div class="line">1</div></pre></td><td class="code"><pre><div class="line"><span class="tag">&lt;<span class="name">link</span> <span class="attr">rel</span>=<span class="string">"stylesheet"</span> <span class="attr">href</span>=<span class="string">"blob:http://localhost:3000/asdasd"</span> /&gt;</span></div></pre></td></tr></table></figure>
<p>这种blob的形式可能会使得css里的url()引用的图片失效，因此建议用带http的绝对地址（这也只有开发环境会用到）。</p>
<p>所以我们有：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// webpack-dev-server中间件</span></div><div class="line">app.use(WebpackDevMiddleware(compiler, &#123;</div><div class="line">    <span class="attr">publicPath</span>: <span class="string">'http://localhost:3000/'</span>,</div><div class="line">    <span class="attr">stats</span>: &#123;</div><div class="line">        <span class="attr">colors</span>: <span class="literal">true</span>,</div><div class="line">        <span class="attr">chunks</span>: <span class="literal">false</span></div><div class="line">    &#125;,</div><div class="line">    <span class="attr">progress</span>: <span class="literal">true</span>,</div><div class="line">    <span class="attr">inline</span>: <span class="literal">true</span>,</div><div class="line">    <span class="attr">hot</span>: <span class="literal">true</span></div><div class="line">&#125;))</div></pre></td></tr></table></figure>
<h3 id="生产环境source-map"><a href="#生产环境source-map" class="headerlink" title="生产环境source map"></a>生产环境source map</h3><p>同样的我们添加<code>devtool</code>：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// build/dev-server.js</span></div><div class="line">webpackConfig.devtool = <span class="string">'source-map'</span></div><div class="line"><span class="comment">// 或者不需要source map</span></div><div class="line">webpackConfig.devtool = <span class="literal">false</span></div></pre></td></tr></table></figure>
<p>生产环境很多时候我们会压缩代码，压缩的时候如果需要生成source map还需要配置：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div></pre></td><td class="code"><pre><div class="line">plugins: [</div><div class="line">    <span class="keyword">new</span> webpack.optimize.UglifyJsPlugin(&#123;</div><div class="line">        <span class="attr">sourceMap</span>: <span class="literal">true</span></div><div class="line">    &#125;)</div><div class="line">    <span class="comment">// ...</span></div><div class="line">]</div></pre></td></tr></table></figure>
<p>参考了<a href="http://acgtofe.com/posts/2016/02/full-live-reload-for-express-with-webpack" target="_blank" rel="external">《Express结合Webpack的全栈自动刷新》</a>。</p>
<h3 id="代码压缩"><a href="#代码压缩" class="headerlink" title="代码压缩"></a>代码压缩</h3><p>既然说到<code>UglifyJsPlugin</code>了，就顺便讲一下代码压缩吧。</p>
<p>其实也没有多少东西，就是上面大家看到的<code>new webpack.optimize.UglifyJsPlugin()</code>，不过配置选项除了<code>sourceMap</code>还有注释<code>comments</code>相关、压缩<code>compress</code>相关。</p>
<p>还有一个问题就是，<code>UglifyJs</code>不支持ES6的压缩，如果代码压缩前没有编译到ES5，则打包任务会报错，通常显示：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line">ERROR <span class="keyword">in</span> xx/xxxxx.js <span class="keyword">from</span> UglifyJs</div><div class="line">Unexpected token xxxx</div></pre></td></tr></table></figure>
<p>这时候我们需要将代码先通过<code>babel</code>生成<code>ES5</code>，然后再压缩：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div></pre></td><td class="code"><pre><div class="line"><span class="built_in">module</span>: &#123;</div><div class="line">    <span class="attr">rules</span>: [</div><div class="line">      &#123;</div><div class="line">        <span class="attr">test</span>: <span class="regexp">/\.js$/</span>,</div><div class="line">        <span class="attr">loader</span>: <span class="string">'babel-loader'</span>,</div><div class="line">        <span class="attr">exclude</span>: <span class="regexp">/node_modules/</span></div><div class="line">      &#125;,</div><div class="line">      <span class="comment">// 其他loader排在后面</span></div><div class="line">    ]</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>大致就酱啦。</p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>本节我们大致了解了source map的功能和一些devtool的选项，包括生产环境和开发环境可能需要注意的地方，以及简单说了个代码压缩的坑。<br>可参考代码<a href="https://github.com/godbasin/vue-multi-pages" target="_blank" rel="external">github-vue-multi-pages</a>，主要是这套环境使用在vue上的demo。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
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  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <strong class="toc-title">文章目录</strong>
  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#devtool"><span class="toc-number">1.</span> <span class="toc-text">devtool</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#关于source-map"><span class="toc-number">1.1.</span> <span class="toc-text">关于source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#devtool选项"><span class="toc-number">1.2.</span> <span class="toc-text">devtool选项</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#开发环境添加source-map"><span class="toc-number">1.3.</span> <span class="toc-text">开发环境添加source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#生产环境source-map"><span class="toc-number">1.4.</span> <span class="toc-text">生产环境source map</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#代码压缩"><span class="toc-number">1.5.</span> <span class="toc-text">代码压缩</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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